CAT9954AWI-G-T2 datasheet(11/16 Pages) CATALYST

Part #	CAT9954AWI-G-T2

Description	8-bit I2C and SMBus I/O Port with Interrupt

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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11 / 16 page

CAT9554, CAT9554A

11

Doc. No. 25088, Rev. B

Characteristics subject to change without notice

Figure 11. Read from Register

Figure 12. Read Input Port Register

Power-On Reset Operation

When the power supply is applied to VCC pin, an internal

power-on reset pulse holds the CAT9554/9554A in a

reset state until VCC reaches VPOR level. At this point, the

reset condition is released and the internal state ma-

chine and the CAT9554/9554A registers are initialized

to their default state.

DATA

S0

1

0

A2

A0

0

A

A1

0

1

0

A2

A1 A0

A

DATA

A

acknowledge

from master

acknowledge from slave

R/W

slave address

data from register

COMMAND BYTE

A

S

1

acknowledge from slave

R/W

At this moment master-transmitter becomes

master-receiver and slave-receiver

becomes slave-transmitter

NA

no acknowledge

from master

data from register

P

last byte

first byte

12

34

5

6

7

8

9

SCL

SDA

READ FROM

PORT

DATA INTO

PORT

S

0100

A2

A0

1

A

A1

A

DATA 4

NA

P

no acknowledge from master

acknowledge from master

acknowledge

from slave

R/W

slave address

data from port

start condition

stop

condition

DATA 2

tPS

tPH

DATA 3

DATA 4

DATA 1

data from port

tIV

tIR

INT

DATA 1

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CAT9954AWI-G-T2 Datasheet(PDF) 11 Page - Catalyst Semiconductor

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